Fascinating read.  This book answers dozens on riddles regading the relationship between our human nature, parasites, and our sexual habits.  An easy read and brilliantly written, The Red Queen offers insights about the constant gentetic battle between parasites (bacteria, viruses, protozoa, works, flukes, etc..) and thier hosts.  As related to Fatiguing Illness, it could help explain some of the chronic infections, as the parasites gained an upper hand (or at least an even hand) the human host is modified to best suite the parasites needs.  Must read stuff.